2 * Copyright (c) 2008-2013 Apple Inc. All rights reserved.
4 * @APPLE_APACHE_LICENSE_HEADER_START@
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * @APPLE_APACHE_LICENSE_HEADER_END@
22 * IMPORTANT: This header file describes INTERNAL interfaces to libdispatch
23 * which are subject to change in future releases of Mac OS X. Any applications
24 * relying on these interfaces WILL break.
27 #ifndef __DISPATCH_SEMAPHORE_INTERNAL__
28 #define __DISPATCH_SEMAPHORE_INTERNAL__
30 struct dispatch_queue_s
;
32 DISPATCH_CLASS_DECL(semaphore
);
33 struct dispatch_semaphore_s
{
34 DISPATCH_STRUCT_HEADER(semaphore
);
36 semaphore_t dsema_port
;
42 #error "No supported semaphore type"
45 long volatile dsema_value
;
47 long volatile dsema_sent_ksignals
;
48 long volatile dsema_group_waiters
;
50 struct dispatch_continuation_s
*volatile dsema_notify_head
;
51 struct dispatch_continuation_s
*volatile dsema_notify_tail
;
54 DISPATCH_CLASS_DECL(group
);
56 #define DISPATCH_GROUP_INITIALIZER(s) \
58 .do_vtable = (const void*)DISPATCH_VTABLE(group), \
59 .do_ref_cnt = DISPATCH_OBJECT_GLOBAL_REFCNT, \
60 .do_xref_cnt = DISPATCH_OBJECT_GLOBAL_REFCNT, \
61 .dsema_value = LONG_MAX - (s), \
62 .dsema_orig = LONG_MAX, \
65 void _dispatch_semaphore_dispose(dispatch_object_t dou
);
66 size_t _dispatch_semaphore_debug(dispatch_object_t dou
, char *buf
,
69 typedef uintptr_t _dispatch_thread_semaphore_t
;
71 _dispatch_thread_semaphore_t
_dispatch_thread_semaphore_create(void);
72 void _dispatch_thread_semaphore_dispose(_dispatch_thread_semaphore_t
);
73 void _dispatch_thread_semaphore_wait(_dispatch_thread_semaphore_t
);
74 void _dispatch_thread_semaphore_signal(_dispatch_thread_semaphore_t
);
76 DISPATCH_ALWAYS_INLINE
77 static inline _dispatch_thread_semaphore_t
78 _dispatch_get_thread_semaphore(void)
80 _dispatch_thread_semaphore_t sema
= (_dispatch_thread_semaphore_t
)
81 _dispatch_thread_getspecific(dispatch_sema4_key
);
82 if (slowpath(!sema
)) {
83 return _dispatch_thread_semaphore_create();
85 _dispatch_thread_setspecific(dispatch_sema4_key
, NULL
);
89 DISPATCH_ALWAYS_INLINE
91 _dispatch_put_thread_semaphore(_dispatch_thread_semaphore_t sema
)
93 _dispatch_thread_semaphore_t old_sema
= (_dispatch_thread_semaphore_t
)
94 _dispatch_thread_getspecific(dispatch_sema4_key
);
95 _dispatch_thread_setspecific(dispatch_sema4_key
, (void*)sema
);
96 if (slowpath(old_sema
)) {
97 return _dispatch_thread_semaphore_dispose(old_sema
);